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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 32, Issue 3

Issues

Interactions between TiAl Alloy and Different Oxide Moulds under High-temperature and Long-time Condition

Yongshuang Cui / Xiaoxia Tang / Ming Gao / Limin Ma / Zhang Hu
Published Online: 2013-06-15 | DOI: https://doi.org/10.1515/htmp-2012-0120

Abstract

Interactions between Ti-47Al-2Cr-2Nb (at.%) alloy and alumina, zirconia and yttria moulds were studied under high-temperature and long-time condition, and the reaction mechanisms were explored. The moulds were prepared by traditional precision casting technique, and the experiments were carried out in a carbon resistance furnace at 1550°C for 30 min. The results indicated that the interfacial reactions between TiAl alloys and alumina and zirconia moulds were serious. Obvious reaction layers composed of Ti-rich phases and Al2O3 inclusions were formed on the alloy-mould interfaces, and a large amount of dark Al2O3 inclusions were found in the alloy matrixes. Interaction between TiAl and yttria mould was mild. No obvious reaction layer was formed on the alloy-mould interface, and only a small amount of white inclusions inferred as Al-Y oxide were found in the alloy matrix. Al2O3 and ZrO2 cannot be used as mould materials for the directional solidification of TiAl alloys. Y2O3 mould possesses a higher stability, which can be used in the directional solidification of TiAl alloys by the proper choice of more stable binder.

Keywords: TiAl alloy; alumina mould; zirconia mould; yttria mould; directional solidification; reaction mechanism

About the article

Received: 2012-08-02

Accepted: 2012-12-07

Published Online: 2013-06-15

Published in Print: 2013-06-14


Citation Information: High Temperature Materials and Processes, Volume 32, Issue 3, Pages 295–302, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp-2012-0120.

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©[2013] by Walter de Gruyter Berlin Boston.Get Permission

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